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Dial Services Overview
114062 Rev. A 1-9
Dial Backup Service
Dial backup service lets you configure backup lines for failed primary lines. A
primary line is a leased line, a leased multiline (Standard and PPP only), or a
leased multilink connection. This leased line acts as the physical connection over
which the leased circuit, the logical connection, carries traffic. You designate
these leased circuits as primary circuits. This designation tells the router to
provide backup service if the primary line and circuit fail.
If a primary circuit fails and you configure dial backup service for that circuit, the
router activates an available backup line. When the primary circuit is restored, the
router reroutes all traffic from the backup to the primary and clears the dial
backup connection.
Dial backup is supported on asynchronous lines, (RS449), synchronous lines
(RS449, V.35, RS422, and X.21) and on ISDN interfaces.
Table 1-1 lists what you can configure as primary and backup lines.
Table 1-2 lists the protocols for each type of primary and backup circuit.
Table 1-1. Primary and Backup Lines
Line Type
Primary Any leased line up to T1/E1 rates, including multiline (Standard and
PPP only) and multilink connections. Frame Relay multiline circuits
cannot be dial backup primaries.
Frame Relay PVCs
Backup Any WAN line including ISDN B channels. Lines must be in the dial
backup pool.
Table 1-2. Primary and Backup Circuit Protocols
If the primary circuit’s protocol is: The backup circuit’s protocol can be:
Standard Async or Sync PPP only
PPP Async or Sync PPP only
Frame Relay -- backing up only one PVC Async or Sync PPP only
Frame Relay -- backing up the entire Frame
Relay interface
Frame Relay only
- Configuring Dial 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 114062 Rev. A vii 7
- 114062 Rev. A ix 9
- 114062 Rev. A 10
- 114062 Rev. A xi 11
- 114062 Rev. A xiii 13
- 114062 Rev. A xv 15
- 114062 Rev. A xvii 17
- About This Guide 19
- Audience 20
- Before You Begin 20
- Conventions 21
- Acronyms 22
- 114062 Rev. A xxiii 23
- 114062 Rev. A xxv 25
- Bay Networks Customer Service 26
- World Wide Web 27
- Customer Service FTP 27
- Support Source CD 28
- CompuServe 28
- InfoFACTS 29
- How to Get Help 29
- Chapter 1 31
- Dial Services Overview 31
- DS0005A 32
- Dial-on-Demand Service 33
- Demand Lines and Pools 34
- 192.32.14.0 35
- 192.32.16.0 35
- Activating Demand Circuits 36
- Terminating Demand Circuits 38
- Dial Backup Service 39
- Primary Line 40
- Backup Line 40
- 1-12 114062 Rev. A 42
- Backup Lines and Pools 43
- 1-14 114062 Rev. A 44
- Activating the Backup Line 45
- 1-16 114062 Rev. A 46
- Bandwidth-on-Demand Service 47
- 1-18 114062 Rev. A 48
- Activating Secondary Lines 50
- Terminating Secondary Lines 50
- Chapter 2 53
- ISDN Overview 53
- ISDN Standards 54
- Primary Rate Interface 55
- The D Channel 55
- 2-4 114062 Rev. A 56
- Figure 2-3. LAPD Frame 56
- ISDN Interfaces 57
- Reference Points 58
- 2-8 114062 Rev. A 60
- Chapter 3 61
- Implementation Notes 61
- Types of Authentication 62
- 114062 Rev. A 3-3 63
- 3-4 114062 Rev. A 64
- Asynchronous PPP 66
- ISDN Services 68
- 114062 Rev. A 3-9 69
- 3-10 114062 Rev. A 70
- 114062 Rev. A 3-11 71
- 3-12 114062 Rev. A 72
- 114062 Rev. A 3-13 73
- Call Screening 74
- Rate Adaption 74
- Example 1 75
- Example 2 75
- 3-16 114062 Rev. A 76
- Chapter 4 77
- PPP Multilink 78
- Static Routes 79
- Traffic Filters 80
- Dial Optimized Routing 81
- 4-6 114062 Rev. A 82
- Protocol Prioritization 83
- Chapter 5 85
- Bandwidth for Backup Circuits 86
- 114062 Rev. A 5-3 87
- 5-4 114062 Rev. A 88
- 114062 Rev. A 5-5 89
- 5-6 114062 Rev. A 90
- 114062 Rev. A 5-7 91
- 5-8 114062 Rev. A 92
- Chapter 6 93
- 6-2 114062 Rev. A 94
- 6-4 114062 Rev. A 96
- 114062 Rev. A 6-5 97
- Chapter 7 99
- Caution: 100
- Pool ID Parameter 107
- Configuring Dial Services 108
- Creating Line Pools 109
- Adding Line Pools 110
- Configuring ISDN Lines 115
- PRI Physical Interfaces 117
- 7-20 114062 Rev. A 118
- 7-22 114062 Rev. A 120
- 7-24 114062 Rev. A 122
- 123
- 124
- 126
- 128
- 129
- 7-32 114062 Rev. A 130
- 131
- 7-34 114062 Rev. A 132
- 137
- 7-40 114062 Rev. A 138
- 7-42 114062 Rev. A 140
- Configuring ISDN Logical Lines 141
- 7-44 114062 Rev. A 142
- 7-46 114062 Rev. A 144
- 114062 Rev. A 7-47 145
- 7-48 114062 Rev. A 146
- 7-50 114062 Rev. A 148
- Local Phone Number Parameters 149
- 7-52 114062 Rev. A 150
- 114062 Rev. A 7-53 151
- Changing Pool IDs and Lines 153
- 114062 Rev. A 7-57 155
- 7-58 114062 Rev. A 156
- 114062 Rev. A 7-59 157
- 7-60 114062 Rev. A 158
- 114062 Rev. A 7-63 161
- 114062 Rev. A 7-65 163
- Chapter 8 165
- Configuring Demand Circuits 165
- Interface for Dialup Lines 167
- Demand Circuit Parameters 169
- Configuring Demand Circuits 171
- 184
- Deleting Demand Circuits 186
- 114062 Rev. A 8-23 187
- 8-24 114062 Rev. A 188
- 4. Click on OK to save 188
- 8-26 114062 Rev. A 190
- 8-28 114062 Rev. A 192
- 114062 Rev. A 8-29 193
- Chapter 9 197
- Configuring Backup Circuits 197
- Circuit Options Parameters 202
- Configuring Backup Circuits 205
- Interface Type Parameter 211
- 219
- 219
- 220
- 9-26 114062 Rev. A 222
- 9-28 114062 Rev. A 224
- 227
- 228
- 228
- 9-34 114062 Rev. A 230
- 114062 Rev. A 9-35 231
- (Figure 232
- Deleting Backup Circuits 234
- Chapter 10 235
- Congestion Monitor Parameters 247
- Deleting Bandwidth Circuits 255
- Chapter 11 257
- Configuring Phone Lists 257
- Configuring Phone Lists 263
- Chapter 12 273
- Configuring Caller Resolution 273
- Configuring Caller Resolution 277
- Appendix A 281
- Configuration Examples 281
- Dial-on-Demand Using PPP 282
- Table A-3. IP Parameters 284
- A-4 114062 Rev. A 284
- Phone List window 285
- A-6 114062 Rev. A 286
- Configuration of Router 1 287
- Configuration of Router 2 288
- Configuration Examples 289
- Table A-10. Demand Pools 289
- A-10 114062 Rev. A 290
- Table A-14. IP Parameters 291
- A-12 114062 Rev. A 292
- A-16 114062 Rev. A 296
- Table A-23. IP Parameters 297
- A-20 114062 Rev. A 300
- Table A-26. Backup Pools 300
- A-22 114062 Rev. A 302
- Appendix B 305
- B-4 114062 Rev. A 308
- B-6 114062 Rev. A 310
- B-8 114062 Rev. A 312
- Appendix C 313
- Ordering PRI Lines 314
- 114062 Rev. A Index-1 315
- 114062 Rev. A Index-3 317
- 114062 Rev. A Index-5 319
- 114062 Rev. A Index-7 321
- 114062 Rev. A Index-9 323
- 114062 Rev. A Index-11 325
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